10-26 Exercise 3: Find roots of a quadratic equation

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Write a program to find roots of a quadratic equation

A quadratic equation is a second order equation having a single variable. Any quadratic equation can be represented as where a, b and c are constants ( a can't be 0) and x is unknown variable. 

寫一個找二次方程的求根程式

For Example

 is a quadratic equation where a, b and c are 2, 5 and 3 respectively.

To calculate the roots of quadratic equation we can use below formula. There are two solutions of a quadratic equation.

使用下列公式:

x = (-b + sqrt(D))/(2*a)
x = (-b - sqrt(D))/(2*a)

where, D = (b*b-4*a*c) is Discriminant (判別式), which differentiate the nature of the roots of quadratic equation.

For the complex result (複數根):

realPart = -b/(2*a);
imaginaryPart =sqrt(-D)/(2*a);

Note: We have used sqrt() function to find square root which is in math.h library.

 

Example input 1:

1 2 1

Example output 1:

Roots of 1.00x^2 + 2.00x + 1.00 = 0 are real and same
x1 = x2 = -1.00

 

Example input 2:

1 -3 2

Example output 2:

Roots of 1.00x^2 + -3.00x + 2.00 = 0 are real and different
x1 = 2.00
x2 = 1.00

 

Example input 3:

1 2 2

Example output 3:

Roots of 1.00x^2 + 2.00x + 2.00 = 0 are complex and different
x1 = -1.00+1.00i
x2 = -1.00-1.00i
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We will continue this question in few days
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Everything is fixed. Enjoy your time with The Judge :)
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ANNNNNNNNNNNNNNNNNNNNNNNNNNGRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
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Your code has newline at the end sometime. You learned this lesson many times!
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After i correct the newline in my code,there is still wrong output.However,I had run the program in Codeblocks.The output is still as well as the result. Seeking for help.
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your output lack of 1 space at line 8 when print out "Roots of ...". Please be careful with all small details when working with online judge
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prog.c: In function 'main':
prog.c:9:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1 = (-b + sqrt(D))/(2*a);
                ^~~~
prog.c:9:16: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:9:16: note: include '<math.h>' or provide a declaration of 'sqrt'
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Hidden content!
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Hidden content!
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}
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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Hidden content!
#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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prog.c: In function 'main':
prog.c:8:11: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     while(scanf("%lf %lf %lf", &a, &b ,&c)==3)
           ^~~~~
prog.c:8:11: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:11: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:18:17: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
                 ^~~~~~
prog.c:18:17: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:18:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:17: warning: incompatible implicit declaration of built-in function 'printf'
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf",a,b,c,x1,x2);
                 ^~~~~~
prog.c:21:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:29:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:29:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:34:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:34:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:41:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
             ^~~~~~
prog.c:41:13: note: include '<stdio.h>' or provide a declaration of 'printf'
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
 *  ** *  ****  *  * * *****  a, b, c, D, spD, x1, x2;
    
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***  ****    * ***    *  *  ******   *****  ****** *   **  
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 ****     * *  **   ***  *  * *  * *   * **   ** ** *****  **  * *  *** ** * *** (x1==x2){
* *  ***      ***    * ****   * * *** *   *** ** **   *  * ** *** *** *  * * **   ****  *  ***  **  ** *     *     ** *  ***  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
** * * **     **  * **** * ** * ***   * *****      *    ** ** ****** ****  **  
* * * ** ***** **** *   *    *** * *  ** *     ***  ** * *** ****      *    ***** **  {
*       *  **** *** *** ***** ***    **  ***  ****   *    **  *****   *   **** *          *   *    *  * ***    **   *  * * ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf\n",a,b,c,x1,x2);
*  ****   **     * ***   *   * * * ***    * ** **  **   * *   **** * **   * *  * ** **
     ** **  *  *** ** ** *  ***** **  *   *  ****  
****  *** *     *  ** *** * **  **  *****   **      ****** * **  if(D==0)
  *   *  * * * *  * * *  * ** ** ****    * ** **  * **** 
*  *  ***** **    * *    ***  **  ******    *   **** * **       * ** ** ** * * ** (-b)/(2*a);
  ** * *  ** *** * * **** * **** *  ****** * *    * ***   *       ****** * *
 ** *   *    ** *   ** ***     *         ****  **** *  ** *******  ****   *** *     * *
    ** ** **    **      *  * *   *** ******   * ***  * **   *      *  **** *     ** * **** *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
*** * **  * **   ** *  *** ** *  ** * * *       * **       ******** ****
*    *****        ** **  *      * * * *  * *     ******  ** *   *  * 
**  **  **  **  *   *   ******** *   * * **  * * *    ** **   *        * **  *     *
***  * ** **  **   **  *  * ***** ******** * *    *** *****  * *   ***  *
 *  *** *** * *  *   *      *    * *** ** *   ** *****  * *   *** ** * *****  *    ** **** **** *** * * ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
  ** ****    ***   * ** * * **    *   *  * *** *   ** ***    **  ***** **   
 * ** ****** * *  ** * * * * *  * ****   ** *** *   ** 
    ***   *  * **      ** *   ** **** ** * ******  if(D<0)
  *   *   * * *** *  **         **   *** * *   *** * *      
  **     *****      ***** ****    *      *****   ***** ***  * *  **  *  * **  (-b)/(2*a);
*** ** * ***    *   **** *  * **  ****  * *     **  ***   **  ****  **  **  *** *       -x1;
****        * ** *   ***  *  * ******  ******** *  *** ** * *** ** * *** ** *** ***** *    * ****  ****  of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
***  ***    * ***** ** ** * **** * *      ** ***    ***** * * 
* *    **  ******  ***   
    
  *      ***   *** *   ****      * **** **  *  *    
**** * *  *  * *   *** *     **** 0;
}
answered by (-249 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
 * ** * ********  ***
 ** *** ****  *  *
** **** ** **  *** * 
int **  **
**  *   ** * ****** **  ****   *** a, b, c, D, spD, x1, x2;
** *   ** ****    * * *** * 
* **   ******   * **    * *** ** ****      %lf   *  * * *   *****  &b   ** *   **
****  **    {
   *  *  **       **** ***** * * ******* ** ** * - (4*a*c);
* *            ** *** **      * ** * *****  * *****  *
*****       *  ***   
* ** *       {
   *    *   **  * * *   ** * *****   *  ****  *** **  * *** ** *     * *  *
**  * *** *** **  ** ** ** * ** * * **  ***   ****  ****   * *   x1= * ****  
 **  **  *  ** *** ** * * *  ** ***  *  *     ***  * ** **    x2=  **       
* *** ** *      ****** *      ***  **  * * *     *** *** *  ****   if (x1==x2){
**  **   ** ***   *******   *****    *** * * * * * * *        * *   * ***    of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = *** **     *   *  **
* ***   ***** *** ** **** ***** **  * ** **** ***   *       *  ** *   **  * ** * 
* * *  ***    ***  ** **      * ** **  *    ****** **     *     *   else {
** * ** *     * * **** *    *  ***  ***  * *****  * * *  *    ****    * *     * * *       * **  * *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and   * **   = %.2lf\nx2 =  *** **   *** ** * *  *
  ***    *  *        * * * ** * **** **  **  * ** * ** *   *   *  * }
* *   ** * *  * **** * *    *** * ***  * **      *    
 **    * **   * *   *    **   ** *    * ** **** **** if(D==0)
****  *   * *** * *****   {
   *  *  *****   ** *        * ** *  * * *  ***  * *  **   * * * *    *** * * ** ** **  *
*** *  **   ****   **  * *****  **     * ** * * * * *    *** **      * ***** **  *** * 
** **   *  *       {
 *  *** **  *  *   * *   *** *   ***  *   ** * ** ** ***** **         * ** * **      ** *   *  ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =       * ****    *  * 
*** *  * ****** * * ***** ******  *      *   ** * *  **   * **  ** **  **  *
 *   * *** *  ** ****    *** ***   *  *** *   * * * ****** *   **  *    *   ****
   *   **  **   ** * *** *    ** ** *   *  *** *  *  **  **   *  * *** **   *    * *
**              {
* *** ** **  * ***   **     *   ******    *  * **   * ** *****     * **   *  ***   * *  ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =   *** *  ** ***   **
 * * **    ***   *  * * **      ** * ** * ** * ********  * * ** **   ** ****
* ***    * ***     ***    **  *** ****   ** * ** *    **
   * *** *******  ** *   * **    *  ** **   *  *  ** ***  * *      **  *  **
 ** *  **       *   **    
            x1=  * ***
* *  * *     *   *  ** ***     * x2= -x1;
  ** * ** *  ***  ** ** ***  **  ******  *    *  *  ****  * * ** *    * ** ****  **      *  **  * of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and  *    * = ** *** * * = *     * *    **  **** *  * 
 ****   ** * **  **  * *  * ****   **** **** *  ** ** * *   
** *  ** ** * *     *  **
     **  *******  * **   ** **  
   **  ***   * * **  *** ******** **    ***  ** * *  **
***** *****   *  **   ** ** ***** 0;
}
answered by (-249 points)
0 0
/tmp/ccvUqbC2.o: In function `main':
prog.c:(.text+0x6e): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
** ** ** *   * * * *
  *    * * ** ***
int main(){
 ** ** * * *    *   * *****    a,b,c;
 ***  *  ***   ** ****** * * * D;
 **  * *  **  * *  *   *  **   ***   **  * %lf * *** * ** **    *  *  * *   *  *
   **  *** *** ***** *   *    **  - 4*a*c ;

   **       * ****    *  *     *** ** ***  of %.2fx^2 + %.2fx + %.2f = 0   ****       

*  * ***** *        **  ** * ****** *
 ** **     *****    *   * * ***    ***** * *   * * *  **      complex and  * ******** *   *
  ***** *  *  * * * *  * *  *   * ***      *  **    ***  *****  * *  *  = ****  **** *     ** (-b) / (2*a) ), sqrt(-D) / (2*a) );
**     ******   **    *  * **  ** ****   * * *       ** = * *  * ***   *  (-b) / (2*a) ), sqrt(-D) / (2*a) );
*      **  * *    
 * *   *** *  * *     ** ***    *  if(D==0){
*    * ** ****  * *      * *  ** **  **   *  ** ** ** **  ** * *    **  real and same\n");
 * ** *    ** *  ***  *** * * **  *  *   ** *    **********   ** * * * = x2 = %.2f",( (-b) / (2*a) ) );
 *    ****  *** *   * **
     ** *** *    * **** *  * *   **  
   ** * * **    ******  *  ****** * ****  * ** *** *   *    * * * *    **    real and * ***    **  
   *   * *** ***      ****   ** *       ** *** ******  * **  *     *  * = %.2f\n",( ((-b) + sqrt(D)) / (2*a) ) );
* **  * * * * * ****    *** ***   ***  * ***** *    *** ** **  * = %.2f", ( ((-b) - sqrt(D)) / (2*a) ) );
 *** *  * *    *     ** **

*** **   *   *  *  ** *    *    *  0;
}
answered by (-116 points)
0 0
/tmp/cc8OPUJA.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccLeUfQ5.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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Hidden content!
#include ****   **** **** 
#include <math.h>
int main()
{
***    *** *  **** *** **** *  a,b,c,x,y,d;
    *** **** *      **   *** *   * * *   * %f *** *** **  * *   **** **  *** *** 
** *    *      *  *   *** * **  ** ** 
  ** *  **    * * ***** * ***** ** ** * ** **
*  **  *  **** *  ****   *  *** ** **
 *  *     *  ** ***       **  * (d>0){
 *   **   * **  *         * **   * * ** ****  ** of %.2fx^2 + %.2fx + %.2f = 0 are real and  * **  **          * 
** * * ***     ******* **** * *  * *** = %.2f\nx2 = %.2f",x,y);
 ** **   * * * *  ****  * 
 * ****  ** *  ** *** ***** ** if (d==0){
 * *  *   ***    *********   *    * *** of %.2fx^2 + %.2fx + %.2f = 0 are real and ****  **  ****  *
 * **  *  ** ** **     * ** *** **   = x2 = %.2f",x);
 *  **  ***** *** **   *** * *
   **  **  *    **** ***** 
*    *** * **    *  ** * *** *   ***
***    **  * * **    **  **  *** ** of %.2fx^2 + %.2fx + %.2f = 0 are complex and *  *  * **  *  **  
*  **    * ** ** ****  *  * *  ** 
   **   * *     *  * *  *     *  ** **   * = *   ******  *****  *
* * ******   *   *   * **    * ***  ** = ** ** ***** ***** 
 * * ***  **** ****   ******

  * *  * *       **    * * *** *  0;
}
answered by (54 points)
1 0
/tmp/ccheVQNV.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccJPGNPl.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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